letters.sh
letters/{a-zA-Z0-1}.jpg
example-text.txt

God gave us a free will.
And he loves us.

#!/bin/bash
# Prepare - dummy files
#for char in {a..z} {A..Z} {0..9} 
#do
#	touch $char.jpg
#done

[[ -z "$1" ]] && \
	echo "$0: Requires a file to parse!" && \
	exit 1

[[ ! -f "$1" ]] && \
	echo "$0: Requires a file to parse!" && \
	exit 1

TEXT_FILE="$1"
CHAR_DIR="$(dirname $0)/letters/"

while read line;do
	len=${#line}
	c=0
	while [[ $c -lt $len ]]
	do 	char=${line:$c:1}
		img="$CHAR_DIR/$char.jpg"
		
		# WHAT TO DO WITH CHAR (-image) ?
		echo "Current char: $char -> $img"
		
		c=$(( $c + 1))
	done
	echo "------------"
done<"$TEXT_FILE"

./letters.sh example-text.txt

Current char: G -> ./letters//G.jpg
Current char: o -> ./letters//o.jpg
Current char: d -> ./letters//d.jpg
Current char:   -> ./letters// .jpg
Current char: g -> ./letters//g.jpg
Current char: a -> ./letters//a.jpg
Current char: v -> ./letters//v.jpg
Current char: e -> ./letters//e.jpg
Current char:   -> ./letters// .jpg
Current char: u -> ./letters//u.jpg
Current char: s -> ./letters//s.jpg
Current char:   -> ./letters// .jpg
Current char: a -> ./letters//a.jpg
Current char:   -> ./letters// .jpg
Current char: f -> ./letters//f.jpg
Current char: r -> ./letters//r.jpg
Current char: e -> ./letters//e.jpg
Current char: e -> ./letters//e.jpg
Current char:   -> ./letters// .jpg
Current char: w -> ./letters//w.jpg
Current char: i -> ./letters//i.jpg
Current char: l -> ./letters//l.jpg
Current char: l -> ./letters//l.jpg
Current char: . -> ./letters//..jpg
------------
Current char: A -> ./letters//A.jpg
Current char: n -> ./letters//n.jpg
Current char: d -> ./letters//d.jpg
Current char:   -> ./letters// .jpg
Current char: h -> ./letters//h.jpg
Current char: e -> ./letters//e.jpg
Current char:   -> ./letters// .jpg
Current char: l -> ./letters//l.jpg
Current char: o -> ./letters//o.jpg
Current char: v -> ./letters//v.jpg
Current char: e -> ./letters//e.jpg
Current char: s -> ./letters//s.jpg
Current char:   -> ./letters// .jpg
Current char: u -> ./letters//u.jpg
Current char: s -> ./letters//s.jpg
Current char: . -> ./letters//..jpg
------------